This example demonstrates a simple VML extrusion.
<!-- Include the VML behavior -->
<style>v\: * { behavior:url(#default#VML); display:inline-block }</style>
<!-- Declare the VML namespace -->
<xml:namespace ns="urn:schemas-microsoft-com:vml" prefix="v" />
<p>
<v:rect fillcolor="lime" style="top:50px;left:50px;width:50px;height:50px">
<v:extrusion on="True" />
</v:rect>
</p>